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* WHAT...Hot conditions with temperatures up to 100 degrees. This will pose a major risk of heat-related illness. * WHERE...Lower Columbia Basin of Oregon and Washington, Grande Ronde Valley, Wallowa County, John Day Basin, Foothills of the Northern Blue Mountains of Oregon, Yakima Valley, and Foothills of the Blue Mountains of Washington. * WHEN...Until 10 PM PDT this evening. * IMPACTS...Heat will significantly increase the risk of heat-related illnesses for those who are sensitive to heat, especially those without effective cooling or adequate hydration.

* WHAT...Hot conditions with temperatures up to 98 degrees. This will pose a moderate risk of heat-related illness. * WHERE...Ochoco-John Day Highlands. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat will significantly increase the risk of heat-related illnesses for those who are sensitive to heat, especially those without effective cooling or adequate hydration.

* WHAT...High temperatures 95 to 105 this afternoon. * WHERE...Portions of North and North Central Idaho and Central, East Central, North Central, Northeast, and Southeast Washington. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Today won't be as hot as it was Sunday, but the risk of heat related illnesses remains high for those without access to air conditioning. Exposure to hot weather day after day increases the potential for heat stress.

...ABUNDANT LIGHTNING POSSIBLE AGAIN MONDAY... * Thunderstorms...Scattered thunderstorms and abundant lightning this afternoon and evening. Best chance is in all of Burns and southern and western Vale BLM. Storms will not be as dry as in recent days, with cores most likely having wetting rains. However, lightning outside of cores will pose significant concerns. Isolated to scattered thunderstorms are expected again Monday afternoon and evening. * Outflow Winds...Up to 55 mph. * Timing...From Monday afternoon through Monday evening.

* WHAT...Dangerously hot conditions with temperatures up to 104 degrees. This will pose a major risk of heat-related illness. * WHERE...Lower Columbia Basin of Oregon and Washington, Grande Ronde Valley, Wallowa County, John Day Basin, Foothills of the Northern Blue Mountains of Oregon, Yakima Valley, and Foothills of the Blue Mountains of Washington. * WHEN...Until 10 PM PDT Monday. * IMPACTS...Extreme heat will significantly increase the risk of heat-related illnesses for much of the population, especially those who are heat sensitive and those without effective cooling or adequate hydration.

* WHAT...Dangerously hot conditions with temperatures up to 104 degrees. This will pose a major risk of heat-related illness. * WHERE...Lower Columbia Basin of Oregon and Washington, Grande Ronde Valley, Wallowa County, John Day Basin, Foothills of the Northern Blue Mountains of Oregon, Yakima Valley, and Foothills of the Blue Mountains of Washington. * WHEN...Until 10 PM PDT Monday. * IMPACTS...Extreme heat will significantly increase the risk of heat-related illnesses for much of the population, especially those who are heat sensitive and those without effective cooling or adequate hydration.

* WHAT...Hot conditions with temperatures up to 98 degrees. This will pose a moderate risk of heat-related illness. * WHERE...Ochoco-John Day Highlands. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat will significantly increase the risk of heat-related illnesses for those who are sensitive to heat, especially those without effective cooling or adequate hydration.

At 620 PM MDT/520 PM PDT/, Doppler radar was tracking thunderstorm outflow winds along a line extending from near Sheep Rock to near Vines Hill. Movement was north at 35 mph. HAZARD...Wind gusts up to 45 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Strong outflow winds will be near... Vale, Ironside Mountain, Brushy Hollow, and Buckbrush Poison Butte around 630 PM MDT. Ironside, Cow Valley, Jamieson, and Eldorado Pass around 640 PM MDT. Brogan and Brogan Hill Summit around 650 PM MDT.

At 519 PM PDT, trained weather spotters reported a strong thunderstorm near Bend, moving northeast at 20 mph. HAZARD...Wind gusts up to 40 mph and half inch hail. SOURCE...Trained weather spotters. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Bend, Redmond, Tumalo, and Powell Butte.

* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North Cascades Generally above 1500 Feet and Fire Weather Zone 659 West Slopes of the Central Cascades Generally above 1500 Feet. * THUNDERSTORMS...Scattered chance of thunderstorms over the Cascade mountains with LAL 3 during the afternoon and evening hours. * OUTFLOW WINDS...Gusty and erratic winds are possible in the vicinity of any thunderstorms that develop. * IMPACTS...Scattered lightning in dry fuels can cause multiple fire starts. Thunderstorms can also bring sudden sharp wind shifts on existing fires, causing rapid changes in a fire's rate of spread and direction of spread. Thunderstorm outflow winds can be a threat for several hours following the start of a new lightning-caused fire. If a fire were to begin, air quality may diminish in the surrounding area.

...VERY HOT, DRY, AND UNSTABLE CONDITIONS CONTINUE TODAY... A strong ridge of high pressure will remain over the area producing hot dry and unstable conditions especially to eastern portions of central Oregon. A weak weather disturbance will move up the coast helping to trigger isolated to scattered thunderstorms in central Oregon through the evening. * AFFECTED AREA...Fire Weather Zones 642 Southern Blue and Strawberry Mountains and 644 Central Blue Mountains. * TIMING...Until 11 PM this evening. * RELATIVE HUMIDITY...As low as 10 percent. * TEMPERATURES...Up to 100. * IMPACTS...Current fires could exhibit extreme fire behavior. * HAINES...As high as 5.

...VERY HOT, DRY, AND UNSTABLE CONDITIONS CONTINUE TODAY... A strong ridge of high pressure will remain over the area producing hot dry and unstable conditions especially to eastern portions of central Oregon. A weak weather disturbance will move up the coast helping to trigger isolated to scattered thunderstorms in central Oregon through the evening. * AFFECTED AREA...Fire Weather Zones 611 Deschutes National Forest -minus Sisters Ranger District and 640 Central Mountains of Oregon. * TIMING...Unitl 10 PM this evening. * RELATIVE HUMIDITY...As low as 10 percent. * TEMPERATURES...Up to 100. * THUNDERSTORMS...Isolated to widely scattered. Lightning activity level of 2 to 3. * OUTFLOW WINDS...35 to 45 mph. Thunderstorm outflow winds may result in erratic fire spread. * IMPACTS...Any lightning strikes combined with hot and dry conditions could cause new fire starts.

* WHAT...High temperatures of 95 to 100 degrees this afternoon. * WHERE...Lake County and eastern Klamath County, Central Siskiyou County, South Central Siskiyou County, North Central and Southeast Siskiyou County, Northeast Siskiyou and Northwest Modoc Counties, Modoc County, and Klamath Basin. * WHEN...Until 11 PM PDT this evening. * IMPACTS...Persistent heat will limit ability to cool down. Additionally, smoke combined with hot temperatures may heighten the potential for heat related illnesses due to limiting the ability to open windows for cooler air.

* WHAT...High temperatures 100 to 110 through Monday. Lows in the mid 60s to mid 70s. * WHERE...Portions of North and North Central Idaho and Central, East Central, North Central, Northeast, and Southeast Washington. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat will increase the risk of heat-related illnesses, especially those without effective cooling or adequate hydration.

* WHAT...Hot temperatures. Valley high temperatures 98 to 105. Highs in the mountains in the 80s and 90s. * WHERE...Holden Village, Stevens Pass, and Stehekin. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat will increase the risk of heat-related illnesses, especially those without effective cooling or adequate hydration.

* AFFECTED AREA... In Washington, * Fire Weather Zone 634 - Southern Gifford Pinchot NF. * Fire Weather Zone 635 - Mount Adams District. * THUNDERSTORMS...Isolated to scattered thunderstorms. * IMPACTS...Frequent lightning and critically dry fuels may result in numerous fire starts. Thunderstorm outflow winds may result in erratic fire spread.

...ABUNDANT LIGHTNING THIS AFTERNOON AND EVENING... ...ABUNDANT LIGHTNING POSSIBLE AGAIN MONDAY... A Red Flag Warning remains in effect for lightning this afternoon and evening. A Fire Weather Watch for lightning is in effect from Monday afternoon through Monday evening. * Thunderstorms...Scattered thunderstorms and abundant lightning this afternoon and evening. Best chance is in all of Burns and southern and western Vale BLM. Storms will not be as dry as in recent days, with cores most likely having wetting rains. However, lightning outside of cores will pose significant concerns. Isolated to scattered thunderstorms are expected again Monday afternoon and evening. * Outflow Winds...Up to 55 mph. * Timing...For the Red Flag Warning, until midnight MDT /11 PM PDT/ tonight. For the Fire Weather Watch, from Monday afternoon through Monday evening.

...ABUNDANT LIGHTNING THIS AFTERNOON AND EVENING... ...ABUNDANT LIGHTNING POSSIBLE AGAIN MONDAY... A Red Flag Warning remains in effect for lightning this afternoon and evening. A Fire Weather Watch for lightning is in effect from Monday afternoon through Monday evening. * Thunderstorms...Scattered thunderstorms and abundant lightning this afternoon and evening. Best chance is in all of Burns and southern and western Vale BLM. Storms will not be as dry as in recent days, with cores most likely having wetting rains. However, lightning outside of cores will pose significant concerns. Isolated to scattered thunderstorms are expected again Monday afternoon and evening. * Outflow Winds...Up to 55 mph. * Timing...For the Red Flag Warning, until midnight MDT /11 PM PDT/ tonight. For the Fire Weather Watch, from Monday afternoon through Monday evening.

* WHAT...Dangerously hot conditions with temperatures 104 to 108 at low elevations. * WHERE...Portions of southwest and west central Idaho and southeast Oregon. * WHEN...Until 9 PM MDT /8 PM PDT/ Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities.

* WHAT...Temperatures 100 to 103 in lowest elevations. * WHERE...Portions of south central and southwest Idaho and northeast and southeast Oregon. * WHEN...Until 9 PM MDT /8 PM PDT/ Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur.